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In meteorology, a cloud is an aerosol comprising a visible mass of minute liquid droplets, frozen crystals, or particles suspended in the atmosphere above the surface of a planetary body. The droplets and crystals may be made of water or various chemicals. On Earth, clouds are formed as a result of saturation of the air when it is cooled to its dew point, or when it gains sufficient moisture (usually in the form of water vapor) from an adjacent source to raise the dew point to the ambient temperature. They are seen in the Earth's homosphere (which includes the troposphere, stratosphere, and mesosphere). Nephology is the science of clouds which is undertaken in the cloud physics branch of meteorology.

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Supercell in Kansas

A cool cloud formation in the town of Severy, Kansas. Taken by Jon Stone

Contributed by Sam Feldstone


Clouds! Clouds! Clouds!

Contributed by Alana Buckley

Thank God for Cameras!

Otherwise some of us would never see something so beautiful!

Contributed by Josh Milligan

Ocean of Clouds!

Everything we miss on a cloudy day>

Contributed by Josh Milligan



Contributed by Josh Milligan

This cloud formed over the top of this mountain :-)

Contributed by Jordan Griffin

Look mommy it's a horsey!!! (In my 4 year old voice)

Contributed by Jordan Griffin

Before the Storm

The clouds before a storm can be very beautiful.

Contributed by Katie Scott

Even clouds know what love is

Even clouds know what love is

Contributed by Heather Michelle Williams

Timelapse clouds

Contributed by Kathryn Vercillo

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